Hoist



' Nov. 10, 1925' 1,560,522

E. .1. ARMSTRONG HOIST Filed Sept; 4. 1923 2 Sheets-Sheet l Nov. 10, 1925- E. J. ARMSTRONG HOIS'I Filed Sept.- 4. 1923 2 Sheets-Sheet 2 lI/III/ 1 1 u I i 1 u Patented Nov. 10, 1925 UNITED STATES PATENT ornce.

EDWIN J'. ARMSTRONG, OF ERIE, PENNSYLVANIA, ASSIGNORQBY DIRECT AND MESNE ASSIGNMENTS, T ERIE STEAM 'SHOVEL COMPANY, OF ERIE, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA.

HOIST.

Application filed September 4, 1923. Serial No. 660,775.

To all whom it may concern:

Be it known that I, EDWIN J. ARMSTRONG, a citizen of the United States, residing at- Erie, in the county of Erie and State of Pennsylvania, have invented new and use, ful Improvements in Hoists, of which the following is a specification.

In the operation of hoisting machines difficulty has been experienced in utilizing certain kinds of motors, such as explosive engines, in that it has been diflicult to set the clutches through which said devices are usually operated at a speed at which the engine should run in operating the device. It is desirable, therefore, to control the speed so as to have it slow enough to permit the setting of the clutches Without too great a shock to the machine or too great wear on the clutch surfaces and still have the speed as high as consistent with this part of the operation in order that the motor may operate properly and may be more readily accelerated to a normal operating speed. In carrying out my invention I prefer to pro+ vide a means through which the operator may by the same motion set the clutch and accelerate the engine. Preferably this should be done automatically and through a speed sensitive controlling mechanism which will give to the engine a speed at which the clutches can properly operate and also a speed at which the device can normally continue the operation after the clutch is set. Other features of the invention and details will appear from the specification and claims. I

The invention is illustrated in the accompanying drawings as follows Fig. 1 shows a plan view of the device.

Fig. 2 a side elevation of the same.

Fig. 3 a plan view of an alternativeconstruction.

Fig. 4 an end view of the clutch mechanism of the alternative construction.

Fig. 5 a section on the line 5-5 in Fig. 4.

Fig. 6 a side elevation of a control mecha nism for the engine, the same being partly in section to better show construction.

1 marks the hoisting drum, 2a shaft on which the drum is mounted, 3 and 4 posts carrying bearings 3 and 4 in which the shaft is journaled, 5 an explosive engine, 6 a

drive shaft of the explosive engine, 7 y a drive wheel of the explosive engine, 8 a belt, or chain extending from the drive wheel to a drive wheel 9 on the drum shaft, 10 afriction clutch Wheel on the drum, 11 a band operating on the Wheel 10, 12 an anchor for the band 11, the anchor being secured in the Wheel '9, 13 a rock shaft journaled in the wheel 9, 14 an eccentric shaft arranged on the shaft 13 and to which the strap 11} is secured, 15 a rock arm onthe shaft 13 opposite an eccentric 14, 16 a link connecting the rock arm with a piston 17, 18 a cylinder in which the piston 17 operates, 19 a mounting on the wheel 9 for a cylinder 18, 20 a spring secured to a bracket 21 extending from the cylinder and to the rock arm 15, the spring tending to return the rock arm to loosen the strap 11, 22 a steam pipe running from a central opening in the shaft 2 to the cylinder 18, and 23 a fluid pressure pipe leading to the central opening in the shaft through a gland 24 at the end of the shaft, the pipe being held in position bya bracket 24 secured to the frame. The fluid pressure pipe 23 extends through a valve 25 and to any source of supply as a receiver (not shown). The valve has an operating handle 26 which is connected by a link 27 with a lever28. The lever is mounted on a shaft 29 and the shaft 29 is journaled in bearings 3031. A brake wheel 32 is mounted on the drum and is operated upon by a brake band 32 controlled'by a'shaft 33 in the usual manner. The shaft 33 has a foot lever 34 in convenient the operator. These parts are of ordinary construction. An intake 35 leads to the engine and this is controlled by a throttle 35" having an operating stem 36. The intake leads from a carburetor 37 of ordinary construction through which fuel is supplied through a pipe 38. The stem 36 extends upwardly and terminates in a spool head 39 in which operate the balled ends 40 of weight levers 41. The weight levers are pivoted at 42 on a carrier 43, the carrier being driven from-the engine ordinarily through a gearing from the timing gears (not shown). The governor, therefore, is a speed sensitive device sensitive to the speed of the engine and controlling the throttle in a manner position to be actuated by common to governors to maintain the engine at a speed to which the governor is adjusted. A spring is arranged around the stem 36 and operates against an adjustable shoulder 46 on the stem and a sliding base 47 on the stem. The base is engaged by the forked end of a rock lever 48, the lever being ar-. ranged on a' rock shaft 49 journaled in bearings 50 mounted on the engine frame. A

rock arm 51 is fixed on the shaft 49 and connected by a link 52 with a rock arm 53 on the shaft 29.

IVit-h the spring 45 under the proper tension-a desired low speed of the engine may be maintained through the control of-the governor and in the present device this speed is as low as consistent with the proper operation of theengine and to the end that the engine may be more readilyhandled is as high as the friction clutch and parts will readily sustain. When the operating lever 28 is-moved to admit fluid to set the clutch this same movement operates through the linkage hereinbefore described to change the tension of the spring 45 and to thus change the speed of the engine leaving it still under the'cont-rol of the governor. Under these conditions if the lever is moved to its extreme the new speed to whichthe governor is set is the desired operating speed for the i hoist.- It will be understood that in the preliminary movement of the lever the valve is moved so as to set the clutch and a continued movement changes the spring tension so that while a through movement of the lever may and ordinarily will be had the operator may give to the engine intermediate speeds if under certain conditions it is necessary to change the spring to intermediate positions. V I

In the alternative construction instead of the fluid actuated clutch the clutch is directly actuated through the pressure of the lever. A rock arm 54 is arranged on the shaft 13 and is connected by a link 54 with a head 55. The head 55 operates in guides 56 on the wheel 9. A link 57 is connected to the head and a companion link 58, the two links 57 and 58 forming in effect a toggle leverQ- The link 58 extends through a slot I 59 in the hub of the Wheel 9 and'shaft 2 and is pivoted at 60 on the wheel. A push pin 61 operates through the end of the shaft against the link 58. An arm 62 operates against the push pin and is carried by a rock shaft 63. The rock shaft is mounted :in bearings 64 carried by the frame 4. -A rock arm 65 is tensioned on the shaft 63 and is connected by a link 66 with the operating lever 28. In this mechanism the pulling of the lever operating through the linkage just described through the direct pressure of the operating lever communicates movement to the rock: arm 54 and consequently sets and releases the clutch. The

other parts of the mechanism are as shown in the preferred construction and the control of the engine is similar.

hat I claim as new is 1. In a hoist, the combination of a drum; a motor driving the drum; a speed sensitive control mechanism controlling the motor; a clutch through which the drum is driven from'the motor; and means operable by the same motion of an operator setting the clutch and varying the control mechanism. 2. In a hoist, the combination-of a drum; a motor driving the drum; a speed sensitive control mechanism controlling the motor comprising a centrifugal and centripetal element; a clutch through which the drum isdriven from the motor; and means oper able by the same motion of an operator-setting the clutch and actuating one of the elements of the speed sensitive device to vary the speed of the motor.

3. In a hoist, the combination of a drum; a motor driving the drum; a speed sensitive control mechanism for the motor; a clutch through which the drum is driven from the motor; means for setting the clutch; and devices for varying the control mechanism to vary the speed ofthe motor.

4. Ina hoist, the combination of a drum; a motor driving the drum; a speed sensitive control mechanism comprising a centrifugal and centripetal element; a clutch through Which the drum is driven; means for operating the clutch; and devices acting through one of the elements of the speed 1 sensitive control mechanism to control the speed of the motor.

5. In a hoist, the combination of a drum; an internal combustion motor driving the drum; a speed sensitive control mechanism 10 controlling said motor; a clutch through which the drum is driven from the motor; and means operable by the same motion of an operator setting the clutch and varying the speed sensitive control mechanism to 110 vary the control of the speed of the motor. 6. In a hoist, the combination of a drum; an internal combustion motor driving the drum; a speed sensitive control mechanism controlling the motor; a friction clutch 115 through which the drum is driven from the motor; and means operable by the same motion of an operator setting theclutch and varying the control mechanism to vary the speed of the motor.

- 7 In a hoist, the combination of a drum; an internal combustion motor driving the drum; a speed sensitive control mechanism controlling the motor; a friction clutch through which the drum is driven from the 125 motor; means for operating the clutch; and devices operating on'the control mechanism to vary the s eed of the motor. 8. In a hOISt the combination of av drum an internal combustion motor driving the 130 drum; a speed sensitive motor control mechanism controlling the motor comprising centrifugal and centripetal elements; a clutch through which the drum is driven from the motor; means for actuating the clutch; and devices acting on one of the elements of the control mechanism for varying the speed of the motor.

9. In a hoist, the combination of a drum; a motor driving the drum; a speed sensitive motor control mechanism; a clutch through which the drum is driven from the motor; fluid actuated means for operating the clutch; a valve controlling said means; devices operating the valve; and means acting automatically With said devices actuating the mechanism to vary the speed of the motor as the clutch is actuated.

In testimony whereof I have hereunto set my hand.

EDWIN J. ARMSTRONG. 

